Sources

found: Oxford DNB online, 30 July 2014(James Thomson (bap. 1788, d. 1850), engraver, was baptized on 5 May 1788 at Mitford, Northumberland; his name is often misspellt "Thompson" both on his work and in art dictionaries; because he showed an interest in art, he was sent to London to be articled to an engraver named Mackenzie in Margaret Street; Thomson became an accomplished engraver, employing both stipple and a mixed style of etching and line or stipple; he produced figure and portrait engravings; he is best known for his portraits, of which he completed a large number for important illustrated works; he died at his house at 97 Albany Street, Regent's Park, London, on 27 September 1850)

found: Mackenzie, I. British prints : dictionary and price guide, 1987(James Thomson (Thompson), 1790-1850; born in Northumberland; lived and worked in London where he died; stipple engraver of small portraits and bookplates, occasional mezzotint engraver of larger portraits and sporting subjects after his contemporaries and his own designs)

found: Bryan, M. Dictionary of painters and engravers. Vol. II, 1889(James Thompson, born at Mitford, in Northumberland, about 1790; he was apprenticed to an engraver in London, then set up for himself; he died in London 27 September 1850)